How to distinguish PET material from HDPE material

First look at the number at the bottom of the bottle, that environmental Peugeot there, 1 for PET, 2 for HDPE, you can see the picture above.

Second except to looking at the number of the bottom of the bottle, sometimes the bottom of the bottle also does not have a number indicating, then we have to look at the bottom of the bottle structure design, due to mold relations. There is a big difference between the bottom of PET plastic bottle and HDPE plastic bottle. There is a line in the middle of the bottom of the HDPE plastic bottle. This line is the parting line, but the PET plastic bottle does not. This is also the difference.

Third look at the bottle mouth, and then HDPE and bottle mouth, because of the different processing technology, there will always be more or less a little rough edge with uneven this as long as careful friends can observe, and PET bottle mouth is blown out of the bottle embryo, so the bottle mouth is very smooth.

Fourth It is PET bottle that he can make all transparent, and HDPE can not, at most can only achieve 30% transparency.

 Fifth because the material of PET plastic bottle is harder, and HDPE is softer, so if we have large and soft PET bottle and PE bottle on hand, we can't help but press the bottle with a heavier finger, and then quickly loosen the finger. Soon you'll find that, by the way, PET bottles come out crisp folding sounds when you press them down and release your hands, which HDPE can't hear.